Excellent, if I can tell by colour then they can't trick me. It sounds pret=
ty cheap, so I'll get enough for future experiments.
Can you recommend what to fill the inside of the box with?
Peter Shute
From: =
.com] On Behalf Of vickipowys
Sent: Tuesday, 28 February 2012 8:54 AM
To:
Subject: Re: [Nature Recordists] Re: Foam for SASS
Yes Peter, Clark Rubber call their stuff 'high density foam' and it
is grey in colour (as opposed to medium density foam which comes in
many colours). The acoustic foam is black. My nearest Clarks used
to be at Bathurst (2 hours away) but they closed and now I have to
get it via mail order from Dubbo where they can never cut it
straight. I agree Clark's website is pretty useless. If you can get
Clarks to cut it in blocks around the size you want, you can then
taper the sides according to Rob's specifications, using a razor
knife with a new blade extended all the way out. And tidy up the cut
surfaces with a little piece of fine sandpaper.
Vicki
On 28/02/2012, at 8:17 AM, Peter Shute wrote:
> Thanks, Vicki. You mean the one they're calling high density but
> which isn't acoustic foam? If that works then it would be better
> not to have to glue it.
>
> It's a pity I can't see the stuff on their web site before I go
> there, or even just order it online to save myself the trouble, but
> the web site is a mess. A search for high density foam takes me to
> anything but what I expect to see.
>
> Peter Shute
>
> ________________________________
> From: <naturerecordists%40yahoogro=
ups.com>
> <naturerecordists%40yahoog=
roups.com>] On Behalf Of vickipowys
> Sent: Tuesday, 28 February 2012 8:06 AM
> To: <naturerecordists%40yahoogroup=
s.com>
> Subject: Re: [Nature Recordists] Re: Foam for SASS
>
>
>
> Peter,
>
> I have always used the grey high-density foam from Clark Rubber,
> which is fairly close in texture to the original foam that was used
> in the Crown SASS design. And you won't have to glue either.
>
> Vicki
>
> On 28/02/2012, at 7:28 AM, Peter Shute wrote:
>
>> Good enough for me then. I'll try to get there tonight and get some
>> of the acoustic foam.
>>
>> The plans also say to fill the void with "dense absorptive material
>> like rubber backed carpet padding". Does that mean similar material
>> to that used for the baffle? I.e. can I just get a bit more of it
>> to put in there?
>>
>> Peter Shute
>>
>> ________________________________
>> From: <naturerecordists%40yahoogr=
oups.com><naturerecordists%
>> 40yahoogroups.com>
>> <naturerecordists%40yahoo=
groups.com><naturerecordists%
>> 40yahoogroups.com>] On Behalf Of hartogj
>> Sent: Tuesday, 28 February 2012 7:19 AM
>> To: <naturerecordists%40yahoogrou=
ps.com><naturerecordists%
>> 40yahoogroups.com>
>> Subject: [Nature Recordists] Re: Foam for SASS
>>
>>
>>
>> Hi Peter,
>> The open cell foam in the nose baffle is part of the original Crown
>> SASS design, and that design has proven good for natural soundscape
>> recording. I think the reason for sticking with the open cell
>> design is mostly for the sake of consistency. Some low frequencies
>> will pass through the foam nose, some frequencies are absorbed, and
>> some will be reflected. The qualities of these transitions will
>> depend on the specific material used.
>>
>> John Hartog
>> rockscallop.org
>>
>> --- In <naturerecordists%40yahoog=
roups.com><naturerecordists%
>> 40yahoogroups.com><naturerecordists%
>> 40yahoogroups.com>, Peter Shute <> wrote:
>>>
>>> I'm building a SASS array to Rob Danielson's design (https://
>>> pantherfile.uwm.edu/type/www/audio-reports/BoundaryMicExperiments/
>>> images/PBB2N-Plans_SASS-LikeDimensionsSept2010.gif), and I have
>>> some questions about the foam used for the nose (baffle?)
>>>
>>> The plans say to use high-density open-celled foam, and I don't
>>> know how to identify the stuff. I rang the local supplier (Clark
>>> Rubber, which Australians would know), and they said they can cut
>>> a piece for a few dollars. But when I mentioned what it was for,
>>> they said it would be better to use acoustic foam, which doesn't
>>> cost much more.
>>>
>>> They said it's similar, but denser. It also comes in thinner
>>> sheets, so I'd have to glue two pieces together.
>>>
>>> Will it be better. Does it even matter?
>>>
>>> If the aim of the foam is to block sound from the other side, why
>>> open cell? Does it work better for that?
>>>
>>> Sorry if these are basic questions, I don't know anything about
>>> foams, their acoustic properties, and how this array works.
>>>
>>> Peter Shute
>>>
>
>
>
>
>
>
>
>
> ------------------------------------
>
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie
> Krause.
>
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